Added cross-compile targets for testing

Using gcc cross compilers and qemu:
- make test CC="arm-linux-gnueabi-gcc --static -mthumb" EXEC="qemu-arm"
- make test CC="powerpc-linux-gnu-gcc --static" EXEC="qemu-ppc"
- make test CC="mips-linux-gnu-gcc --static" EXEC="qemu-mips"

Also separated out Travis jobs and added some size reporting

.travis.yml

@@ -1,10 +1,13 @@
+# Environment variables
 env:
+  global:
     - CFLAGS=-Werror
 
+# Common test script
 script:
   # make sure example can at least compile
   - sed -n '/``` c/,/```/{/```/d; p;}' README.md > test.c &&
-      make all size CFLAGS+="
+    make all CFLAGS+="
         -Duser_provided_block_device_read=NULL
         -Duser_provided_block_device_prog=NULL
         -Duser_provided_block_device_erase=NULL
@@ -19,7 +22,89 @@ script:
   - make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=512    -DLFS_PROG_SIZE=512"
   - make test QUIET=1 CFLAGS+="-DLFS_BLOCK_COUNT=1023 -DLFS_LOOKAHEAD=2048"
 
+  - make clean test QUIET=1 CFLAGS+="-DLFS_NO_INTRINSICS"
+
+  # compile and find the code size with the smalles configuration
+  - make clean size
+        OBJ="$(ls lfs*.o | tr '\n' ' ')"
+        CFLAGS+="-DLFS_NO{ASSERT,DEBUG,WARN,ERROR}"
+        | tee sizes
+
+  # update status if we succeeded, compare with master if possible
+  - |
+    if [ "$TRAVIS_TEST_RESULT" -eq 0 ]
+    then
+        CURR=$(tail -n1 sizes | awk '{print $1}')
+        STATUS="Passed, code size is ${CURR}B"
+
+        PREV=$(curl https://api.github.com/repos/$TRAVIS_REPO_SLUG/status/master \
+            | jq -r ".statuses[] | select(.context == \"ci/$NAME\").description" \
+            | sed 's/.*code size is \([0-9]*\).*/\1/' \
+            || echo 0)
+        if [ "$PREV" -ne 0 ]
+        then
+            STATUS="$STATUS ($(python -c "print '%+.2f' % (100*($CURR-$PREV)/$PREV.0)")%)"
+        fi
+    fi
+
+# CI matrix
+matrix:
+  include:
+    # native testing
+    - env:
+        - NAME=littlefs-x86
+
+    # cross-compile with ARM (thumb mode)
+    - env:
+        - NAME=littlefs-arm
+        - CC="arm-linux-gnueabi-gcc --static -mthumb"
+        - EXEC="qemu-arm"
+      install:
+        - sudo apt-get install gcc-arm-linux-gnueabi qemu-user
+        - arm-linux-gnueabi-gcc --version
+        - qemu-arm -version
+
+    # cross-compile with PowerPC
+    - env:
+        - NAME=littlefs-powerpc
+        - CC="powerpc-linux-gnu-gcc --static"
+        - EXEC="qemu-ppc"
+      install:
+        - sudo apt-get install gcc-powerpc-linux-gnu qemu-user
+        - powerpc-linux-gnu-gcc --version
+        - qemu-ppc -version
+
+    # cross-compile with MIPS
+    - env:
+        - NAME=littlefs-mips
+        - CC="mips-linux-gnu-gcc --static"
+        - EXEC="qemu-mips"
+      install:
+        - sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial main universe"
+        - sudo apt-get -qq update
+        - sudo apt-get install gcc-mips-linux-gnu qemu-user
+        - mips-linux-gnu-gcc --version
+        - qemu-mips -version
+
     # self-host with littlefs-fuse for fuzz test
+    - env:
+        - NAME=littlefs-fuse
+      install:
+        - sudo apt-get install libfuse-dev
+        - git clone --depth 1 https://github.com/geky/littlefs-fuse
+        - fusermount -V
+        - gcc --version
+      before_script:
+        # setup disk for littlefs-fuse
+        - rm -rf littlefs-fuse/littlefs/*
+        - cp -r $(git ls-tree --name-only HEAD) littlefs-fuse/littlefs
+
+        - mkdir mount
+        - sudo chmod a+rw /dev/loop0
+        - dd if=/dev/zero bs=512 count=2048 of=disk
+        - losetup /dev/loop0 disk
+      script:
+        # self-host test
         - make -C littlefs-fuse
 
         - littlefs-fuse/lfs --format /dev/loop0
@@ -32,23 +117,41 @@ script:
         - ls
         - make -B test_dirs test_files QUIET=1
 
+# Manage statuses
 before_install:
-    - fusermount -V
+  - |
-    - gcc --version
+    curl -u $GEKY_BOT_STATUSES -X POST \
+        https://api.github.com/repos/$TRAVIS_REPO_SLUG/statuses/${TRAVIS_PULL_REQUEST_SHA:-$TRAVIS_COMMIT} \
+        -d "{
+            \"context\": \"ci/$NAME\",
+            \"state\": \"pending\",
+            \"description\": \"${STATUS:-In progress}\",
+            \"target_url\": \"https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID\"
+        }"
 
-install:
+after_failure:
-    - sudo apt-get install libfuse-dev
+  - |
-    - git clone --depth 1 https://github.com/geky/littlefs-fuse
+    curl -u $GEKY_BOT_STATUSES -X POST \
+        https://api.github.com/repos/$TRAVIS_REPO_SLUG/statuses/${TRAVIS_PULL_REQUEST_SHA:-$TRAVIS_COMMIT} \
+        -d "{
+            \"context\": \"ci/$NAME\",
+            \"state\": \"failure\",
+            \"description\": \"${STATUS:-Failed}\",
+            \"target_url\": \"https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID\"
+        }"
 
-before_script:
+after_success:
-    - rm -rf littlefs-fuse/littlefs/*
+  - |
-    - cp -r $(git ls-tree --name-only HEAD) littlefs-fuse/littlefs
+    curl -u $GEKY_BOT_STATUSES -X POST \
-
+        https://api.github.com/repos/$TRAVIS_REPO_SLUG/statuses/${TRAVIS_PULL_REQUEST_SHA:-$TRAVIS_COMMIT} \
-    - mkdir mount
+        -d "{
-    - sudo chmod a+rw /dev/loop0
+            \"context\": \"ci/$NAME\",
-    - dd if=/dev/zero bs=512 count=2048 of=disk
+            \"state\": \"success\",
-    - losetup /dev/loop0 disk
+            \"description\": \"${STATUS:-Passed}\",
+            \"target_url\": \"https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID\"
+        }"
 
+# Automatically update releases
 deploy:
   # Let before_deploy take over
   provider: script
@@ -65,14 +168,14 @@ before_deploy:
   - LFS_VERSION="v$LFS_VERSION_MAJOR.$LFS_VERSION_MINOR"
   - echo "littlefs version $LFS_VERSION"
   - |
-      curl -u $GEKY_BOT -X POST \
+    curl -u $GEKY_BOT_RELEASES -X POST \
       https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs \
       -d "{
         \"ref\": \"refs/tags/$LFS_VERSION\",
         \"sha\": \"$TRAVIS_COMMIT\"
       }"
   - |
-      curl -f -u $GEKY_BOT -X PATCH \
+    curl -f -u $GEKY_BOT_RELEASES -X PATCH \
       https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs/tags/$LFS_VERSION \
       -d "{
         \"sha\": \"$TRAVIS_COMMIT\"
@@ -82,7 +185,7 @@ before_deploy:
   - |
     if [ $(git tag -l "$LFS_PREV_VERSION") ]
     then
-        curl -u $GEKY_BOT -X POST \
+      curl -u $GEKY_BOT_RELEASES -X POST \
           https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases \
           -d "{
               \"tag_name\": \"$LFS_VERSION\",
@@ -94,7 +197,7 @@ before_deploy:
       CHANGES=$(
           git log --oneline $LFS_PREV_VERSION.. --grep='^Merge' --invert-grep
       )
-        curl -f -u $GEKY_BOT -X PATCH \
+      curl -f -u $GEKY_BOT_RELEASES -X PATCH \
           https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/$(
               jq -r '.id' <<< "$RELEASE"
           ) \

Makefile

@@ -1,8 +1,8 @@
 TARGET = lfs
 
-CC = gcc
+CC ?= gcc
-AR = ar
+AR ?= ar
-SIZE = size
+SIZE ?= size
 
 SRC += $(wildcard *.c emubd/*.c)
 OBJ := $(SRC:.c=.o)

tests/test.py

@@ -33,9 +33,14 @@ def generate(test):
         pass
 
 def compile():
-    subprocess.check_call(['make', '--no-print-directory', '-s'])
+    subprocess.check_call([
+            os.environ.get('MAKE', 'make'),
+            '--no-print-directory', '-s'])
 
 def execute():
+    if 'EXEC' in os.environ:
+        subprocess.check_call([os.environ['EXEC'], "./lfs"])
+    else:
         subprocess.check_call(["./lfs"])
 
 def main(test=None):