Merge pull request #25 from q66/ppc-no-alias

fix ALIAS usage in ppc, fix meson build, hide libucontext_trampoline

arch/common/common-trampoline.c

@@ -14,6 +14,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+__attribute__ ((visibility ("hidden")))
 void
 libucontext_trampoline(void)
 {

arch/mips/startcontext.S

@@ -14,6 +14,7 @@ LOCALSZ = 1
 
 #include "defs.h"
 
+.hidden libucontext_trampoline
 FUNC(libucontext_trampoline)
 	move	$gp, $s1
 

arch/mips64/startcontext.S

@@ -14,6 +14,7 @@ LOCALSZ = 1
 
 #include "defs.h"
 
+.hidden libucontext_trampoline
 FUNC(libucontext_trampoline)
 	move	$gp, $s1
 

arch/ppc/swapcontext.S

@@ -14,7 +14,10 @@
 
 ALIAS(swapcontext, __libucontext_swapcontext)
 ALIAS(__swapcontext, __libucontext_swapcontext)
-ALIAS(libucontext_swapcontext, __libucontext_swapcontext)
+
+/* make sure this is visible regardless of EXPORT_UNPREFIXED */
+.weak libucontext_swapcontext
+libucontext_swapcontext = __libucontext_swapcontext
 
 FUNC(__libucontext_swapcontext)
 	li 0, 249     # SYS_swapcontext

arch/ppc64/swapcontext.S

@@ -14,7 +14,10 @@
 
 ALIAS(swapcontext, __libucontext_swapcontext)
 ALIAS(__swapcontext, __libucontext_swapcontext)
-ALIAS(libucontext_swapcontext, __libucontext_swapcontext)
+
+/* make sure this is visible regardless of EXPORT_UNPREFIXED */
+.weak libucontext_swapcontext
+libucontext_swapcontext = __libucontext_swapcontext
 
 FUNC(__libucontext_swapcontext)
 	addis 2, 12, .TOC.-__libucontext_swapcontext@ha

arch/s390x/startcontext.S

@@ -12,6 +12,7 @@
 
 #include "defs.h"
 
+.hidden libucontext_trampoline
 FUNC(libucontext_trampoline)
 	basr	%r14, %r7			/* run function pointer (%r7) and return here */
 	ltgr	%r8, %r8			/* check to see if uc_link (%r8) is null */

meson.build

@@ -2,6 +2,7 @@ project(
   'libucontext',
   'c',
   meson_version : '>=0.55.0',
+  default_options: ['c_std=gnu99', 'default_library=both'],
   version : run_command('head', files('VERSION')).stdout()
 )
 
@@ -39,6 +40,10 @@ if cpu not in ['mips', 'mips64', 'ppc', 'ppc64', 's390x']
   project_source_files += [
     'arch' / cpu / 'trampoline.c'
   ]
+else
+  project_source_files += [
+    'arch' / cpu / 'startcontext.S'
+  ]
 endif
 
 project_includes = [
@@ -47,10 +52,7 @@ project_includes = [
 ]
 
 build_args = [
-  '-std=gnu99',
-  '-D_BSD_SOURCE',
-  '-fPIC',
-  '-DPIC'
+  '-D_BSD_SOURCE'
 ]
 
 
@@ -68,11 +70,9 @@ if freestanding
   build_args += '-DFREESTANDING'
   build_posix = false
   export_unprefixed = false
-  project_headers += ['arch' / cpu / 'include/libucontext/bits.h']
-  project_includes += ['arch' / cpu / 'include']
+  project_headers += ['arch' / cpu / 'freestanding/bits.h']
 else
-  project_headers += ['arch/common/include/libucontext/bits.h']
-  project_includes += ['arch/common/include']
+  project_headers += ['arch/common/bits.h']
 endif
 
 if export_unprefixed
@@ -84,37 +84,31 @@ endif
 # ======
 
 headers = include_directories(project_includes)
-is_subproject = meson.is_subproject()
-# Build only static library if subproject
 
-libucontext_target = both_libraries(
+libucontext_target = library(
   'ucontext',
   project_source_files,
   version: meson.project_version(),
-  install : not is_subproject,
+  install : not meson.is_subproject(),
   c_args : build_args,
+  pic: true,
   include_directories : headers,
 )
-if is_subproject
-  libucontext_target = libucontext_target.get_static_lib()
-endif
 libucontext_dep = declare_dependency(
   include_directories: headers,
   link_with : libucontext_target
 )
 
 if build_posix
-  libucontext_posix_target = both_libraries(
+  libucontext_posix_target = library(
     'ucontext_posix',
     project_source_files + ['libucontext_posix.c'],
     version: meson.project_version(),
-    install : not is_subproject,
+    install : not meson.is_subproject(),
     c_args : build_args,
+    pic: true,
     include_directories : headers,
   )
-  if is_subproject
-    libucontext_posix_target = libucontext_posix_target.get_static_lib()
-  endif
   libucontext_posix_dep = declare_dependency(
     include_directories: headers,
     link_with : libucontext_posix_target
@@ -125,7 +119,7 @@ endif
 # Project
 # =======
 
-if not is_subproject
+if not meson.is_subproject()
   # Make this library usable from the system's
   # package manager.
   install_headers(project_headers, subdir : meson.project_name())
@@ -145,7 +139,7 @@ endif
 # ====
 
 # TODO: meson.build for docs
-if not is_subproject
+if not meson.is_subproject()
   #subdir('docs')
 endif
 
@@ -153,7 +147,6 @@ endif
 # Unit Tests
 # ==========
 
-if not is_subproject
 test('test_libucontext',
   executable(
     'test_libucontext',
@@ -167,9 +160,8 @@ if not is_subproject
     executable(
       'test_libucontext_posix',
       files('test_libucontext_posix.c'),
-        dependencies : libucontext_posix_dep,
+      dependencies : [libucontext_dep, libucontext_posix_dep],
       install : false
     )
   )
 endif
-endif