From 1f8dd07b2d5b86a09b28e2d69155121fdf2cd218 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 13 Feb 2012 10:02:58 -0500
Subject: [PATCH] try_compile: Use random executable file name (#12957)

Append a random number to the "cmTryCompileExec" file name to avoid
rapid creation and deletion of the same executable file name.  Some
filesystems lock executable files when they are created and cause
subsequent try-compile tests to fail arbitrarily.  Use a different
name each time to avoid conflict.
---
 Source/cmCoreTryCompile.cxx |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index dca2fb3..aa31a9e 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -25,7 +25,8 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
 
   const char* sourceDirectory = argv[2].c_str();
   const char* projectName = 0;
-  const char* targetName = 0;
+  char targetNameBuf[64] = "cmTryCompileExec";
+  const char* targetName = targetNameBuf;
   int extraArgs = 0;
 
   // look for CMAKE_FLAGS and store them
@@ -281,16 +282,19 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
       cmakeFlags.push_back(flag);
       }
 
+    /* Use a random file name to avoid rapid creation and deletion
+       of the same executable name (some filesystems fail on that).  */
+    sprintf(targetNameBuf, "cmTryCompileExec%u",
+            cmSystemTools::RandomSeed());
+
     /* Put the executable at a known location (for COPY_FILE).  */
     fprintf(fout, "SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY \"%s\")\n",
             this->BinaryDirectory.c_str());
     /* Create the actual executable.  */
-    fprintf(fout, "ADD_EXECUTABLE(cmTryCompileExec \"%s\")\n",source.c_str());
-    fprintf(fout,
-            "TARGET_LINK_LIBRARIES(cmTryCompileExec ${LINK_LIBRARIES})\n");
+    fprintf(fout, "ADD_EXECUTABLE(%s \"%s\")\n", targetName, source.c_str());
+    fprintf(fout, "TARGET_LINK_LIBRARIES(%s ${LINK_LIBRARIES})\n",targetName);
     fclose(fout);
     projectName = "CMAKE_TRY_COMPILE";
-    targetName = "cmTryCompileExec";
     // if the source is not in CMakeTmp
     if(source.find("CMakeTmp") == source.npos)
       {
-- 
1.7.8.msysgit.0

--- C:/Users/lasso/devel/cmake-2.8.7/Source/cmCoreTryCompile.cxx	Fri Dec 30 12:17:16 2011
+++ C:/Users/lasso/devel/cmake-2.8.7-patched/Source/cmCoreTryCompile.cxx	Thu Feb 16 09:15:54 2012
@@ -281,16 +281,21 @@
       cmakeFlags.push_back(flag);
       }
 
+    /* Use a random file name to avoid rapid creation and deletion
+       of the same executable name (some filesystems fail on that).  */
+    char randomTargetNameBuf[64] = {0};
+    sprintf(randomTargetNameBuf, "cmTryCompileExec%u",
+            cmSystemTools::RandomSeed());
+    targetName = randomTargetNameBuf;
+    projectName = "CMAKE_TRY_COMPILE";
+
     /* Put the executable at a known location (for COPY_FILE).  */
     fprintf(fout, "SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY \"%s\")\n",
             this->BinaryDirectory.c_str());
     /* Create the actual executable.  */
-    fprintf(fout, "ADD_EXECUTABLE(cmTryCompileExec \"%s\")\n",source.c_str());
-    fprintf(fout,
-            "TARGET_LINK_LIBRARIES(cmTryCompileExec ${LINK_LIBRARIES})\n");
+    fprintf(fout, "ADD_EXECUTABLE(%s \"%s\")\n", targetName, source.c_str());
+    fprintf(fout, "TARGET_LINK_LIBRARIES(%s ${LINK_LIBRARIES})\n",targetName);
     fclose(fout);
-    projectName = "CMAKE_TRY_COMPILE";
-    targetName = "cmTryCompileExec";
     // if the source is not in CMakeTmp
     if(source.find("CMakeTmp") == source.npos)
       {

From 4fbdce2b79b28566ae2c6708c99af5e0e8e0177b Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 13 Feb 2012 10:02:58 -0500
Subject: [PATCH] try_compile: Use random executable file name (#12957)

Append a random number to the "cmTryCompileExec" file name to avoid
rapid creation and deletion of the same executable file name.  Some
filesystems lock executable files when they are created and cause
subsequent try-compile tests to fail arbitrarily.  Use a different
name each time to avoid conflict.
---
 Source/cmCoreTryCompile.cxx |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index dca2fb3..7d84ba6 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -26,6 +26,7 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
   const char* sourceDirectory = argv[2].c_str();
   const char* projectName = 0;
   const char* targetName = 0;
+  char targetNameBuf[64];
   int extraArgs = 0;
 
   // look for CMAKE_FLAGS and store them
@@ -281,16 +282,20 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
       cmakeFlags.push_back(flag);
       }
 
+    /* Use a random file name to avoid rapid creation and deletion
+       of the same executable name (some filesystems fail on that).  */
+    sprintf(targetNameBuf, "cmTryCompileExec%u",
+            cmSystemTools::RandomSeed());
+    targetName = targetNameBuf;
+
     /* Put the executable at a known location (for COPY_FILE).  */
     fprintf(fout, "SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY \"%s\")\n",
             this->BinaryDirectory.c_str());
     /* Create the actual executable.  */
-    fprintf(fout, "ADD_EXECUTABLE(cmTryCompileExec \"%s\")\n",source.c_str());
-    fprintf(fout,
-            "TARGET_LINK_LIBRARIES(cmTryCompileExec ${LINK_LIBRARIES})\n");
+    fprintf(fout, "ADD_EXECUTABLE(%s \"%s\")\n", targetName, source.c_str());
+    fprintf(fout, "TARGET_LINK_LIBRARIES(%s ${LINK_LIBRARIES})\n",targetName);
     fclose(fout);
     projectName = "CMAKE_TRY_COMPILE";
-    targetName = "cmTryCompileExec";
     // if the source is not in CMakeTmp
     if(source.find("CMakeTmp") == source.npos)
       {
-- 
1.7.8.msysgit.0