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authorFelipe Magno de Almeida <felipe@expertise.dev>2021-01-01 17:31:37 -0300
committerFelipe Magno de Almeida <felipe@expertise.dev>2021-01-01 17:34:01 -0300
commit6f23a9daa18c4536ee8a530411cd249bd5e5f239 (patch)
tree960f718bdc67e32735e92dee0944fb9ff9f59eba /src/lib/ector/software/meson.build
parentff73049593e52a0bafc1d8aa8727d6dbf8a286b6 (diff)
ector: Rename EAPI macro to ECTOR_API in Ector library
Summary: Patch from a series of patches to rename EAPI symbols to specific library DSOs. = The Rationale = EAPI was designed to be able to pass `__attribute__ ((visibility ("default")))` for symbols with GCC, which would mean that even if -fvisibility=hidden was used when compiling the library, the needed symbols would get exported. MSVC __almost__ works like GCC (or mingw) in which you can declare everything as export and it will just work (slower, but it will work). But there's a caveat: global variables will not work the same way for MSVC, but works for mingw and GCC. For global variables (as opposed to functions), MSVC requires correct DSO visibility for MSVC: instead of declaring a symbol as export for everything, you need to declare it as import when importing from another DSO and export when defining it locally. With current EAPI definitions, we get the following example working in mingw and MSVC (observe it doesn't define any global variables as exported symbols). Example 1: dll1: ``` EAPI void foo(void); EAPI void bar() { foo(); } ``` dll2: ``` EAPI void foo() { printf ("foo\n"); } ``` This works fine with API defined as __declspec(dllexport) in both cases and for gcc defining as `__atttribute__((visibility("default")))`. However, the following: Example 2: dll1: ``` EAPI extern int foo; EAPI void foobar(void); EAPI void bar() { foo = 5; foobar(); } ``` dll2: ``` EAPI int foo = 0; EAPI void foobar() { printf ("foo %d\n", foo); } ``` This will work on mingw but will not work for MSVC. And that's why EAPI is the only solution that worked for MSVC. Co-authored-by: João Paulo Taylor Ienczak Zanette <jpaulotiz@gmail.com> Co-authored-by: Ricardo Campos <ricardo.campos@expertise.dev> Co-authored-by: Lucas Cavalcante de Sousa <lucks.sousa@gmail.com> Reviewers: vtorri, woohyun, jptiz, lucas Reviewed By: vtorri Subscribers: cedric, #reviewers, #committers Tags: #efl Differential Revision: https://phab.enlightenment.org/D12226
Diffstat (limited to 'src/lib/ector/software/meson.build')
-rw-r--r--src/lib/ector/software/meson.build1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/ector/software/meson.build b/src/lib/ector/software/meson.build
index 75d217142a..a87f66efa5 100644
--- a/src/lib/ector/software/meson.build
+++ b/src/lib/ector/software/meson.build
@@ -33,6 +33,7 @@ foreach eo_file : pub_eo_files
33 '-o', 'h:' + join_paths(meson.current_build_dir(), eo_file + '.h'), 33 '-o', 'h:' + join_paths(meson.current_build_dir(), eo_file + '.h'),
34 '-o', 'c:' + join_paths(meson.current_build_dir(), eo_file + '.c'), 34 '-o', 'c:' + join_paths(meson.current_build_dir(), eo_file + '.c'),
35 '-o', 'd:' + join_paths(meson.current_build_dir(), eo_file + '.d'), 35 '-o', 'd:' + join_paths(meson.current_build_dir(), eo_file + '.d'),
36 '-e', 'ECTOR_API',
36 '-gchd', '@INPUT@']) 37 '-gchd', '@INPUT@'])
37endforeach 38endforeach
38 39