build: skip tests when building for iOS

[moluopro]

I tried building for the iOS following the doc and encountered the following error:

...
TEST 1520/1522 csbmv:xerbla_inc_c_zero [OK]
TEST 1521/1522 csbmv:xerbla_k_invalid [OK]
TEST 1522/1522 csbmv:xerbla_lda_invalid [OK]
RESULTS: 1522 tests (1516 ok, 6 failed, 0 skipped) ran in 184 ms
make[1]: *** [run_test] Error 6
make: *** [tests] Error 2

Initially, I thought this was caused by the tests being built, so I tried modifying the doc's make to make libs. However, I was informed that "Cross-build condition should already prevent running the tests".

The original build process didn’t distinguish the iOS platform and treated it the same as Darwin. I updated the Darwin build process as follows:

1. Add in ctest.c:

#if defined(TARGET_OS_IPHONE)
OS_IOS
#endif

2. Add an is_ios variable in c_check, setting cross=1 when it is true.

I tested this on a physical device, and the iOS build now works correctly.

[martin-frbg]

Curious as the CI job on Cirrus does not run into such problems

[moluopro]

Curious as the CI job on Cirrus does not run into such problems

From the logic of the build script, this issue does exist. I ran some tests locally, and the results support my thinking. Is there anything else I need to adjust?

[moluopro]

I found the reason. In .cirrus.yml, when building the iOS library, CROSS=1 was set manually. I think iOS and Android builds should be consistent (i.e., it should work properly without manually specifying CROSS=1). Of course, this is also how it is described in the documentation.

macos_instance:
  image: ghcr.io/cirruslabs/macos-sonoma-xcode:latest
task:
  name: AppleM1/LLVM armv8-ios xbuild
  ......
  - make TARGET=ARMV8 NUM_THREADS=32 HOSTCC=clang NOFORTRAN=1 CROSS=1