Resolve complation issues with -fno-common (default from gcc-10)

Extends the MakeHeader script to auto-generate correct "extern"
function declarations in some cases that it currently does not.

Related to https://github.com/hishamhm/htop/pull/981

CRT.c

@@ -131,9 +131,9 @@ typedef enum ColorElements_ {
    LAST_COLORELEMENT
 } ColorElements;
 
-void CRT_fatalError(const char* note) __attribute__ ((noreturn));
+extern void CRT_fatalError(const char* note) __attribute__ ((noreturn));
 
-void CRT_handleSIGSEGV(int sgn);
+extern void CRT_handleSIGSEGV(int sgn);
 
 #define KEY_ALT(x) (KEY_F(64 - 26) + (x - 'A'))
 

CRT.h

@@ -119,9 +119,9 @@ typedef enum ColorElements_ {
    LAST_COLORELEMENT
 } ColorElements;
 
-void CRT_fatalError(const char* note) __attribute__ ((noreturn));
+extern void CRT_fatalError(const char* note) __attribute__ ((noreturn));
 
-void CRT_handleSIGSEGV(int sgn);
+extern void CRT_handleSIGSEGV(int sgn);
 
 #define KEY_ALT(x) (KEY_F(64 - 26) + (x - 'A'))
 
@@ -140,7 +140,7 @@ extern const char **CRT_treeStr;
 
 extern int CRT_delay;
 
-int* CRT_colors;
+extern int* CRT_colors;
 
 extern int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT];
 
@@ -150,21 +150,21 @@ extern int CRT_scrollHAmount;
 
 extern int CRT_scrollWheelVAmount;
 
-char* CRT_termType;
+extern char* CRT_termType;
 
 // TODO move color scheme to Settings, perhaps?
 
 extern int CRT_colorScheme;
 
-void *backtraceArray[128];
+extern void *backtraceArray[128];
 
 #if HAVE_SETUID_ENABLED
 
 #define DIE(msg) do { CRT_done(); fprintf(stderr, msg); exit(1); } while(0)
 
-void CRT_dropPrivileges();
+extern void CRT_dropPrivileges();
 
-void CRT_restorePrivileges();
+extern void CRT_restorePrivileges();
 
 #else
 
@@ -179,18 +179,18 @@ void CRT_restorePrivileges();
 
 // TODO: pass an instance of Settings instead.
 
-void CRT_init(int delay, int colorScheme);
+extern void CRT_init(int delay, int colorScheme);
 
-void CRT_done();
+extern void CRT_done();
 
-void CRT_fatalError(const char* note);
+extern void CRT_fatalError(const char* note);
 
-int CRT_readKey();
+extern int CRT_readKey();
 
-void CRT_disableDelay();
+extern void CRT_disableDelay();
 
-void CRT_enableDelay();
+extern void CRT_enableDelay();
 
-void CRT_setColors(int colorScheme);
+extern void CRT_setColors(int colorScheme);
 
 #endif

linux/LinuxProcess.c

@@ -154,7 +154,8 @@ typedef struct LinuxProcess_ {
 
 }*/
 
-long long btime; /* semi-global */
+/* semi-global */
+long long btime;
 
 ProcessFieldData Process_fields[] = {
    [0] = { .name = "", .title = NULL, .description = NULL, .flags = 0, },

linux/LinuxProcess.h

@@ -144,7 +144,8 @@ typedef struct LinuxProcess_ {
 #endif
 
 
-long long btime; /* semi-global */
+/* semi-global */
+extern long long btime;
 
 extern ProcessFieldData Process_fields[];
 
@@ -152,9 +153,9 @@ extern ProcessPidColumn Process_pidColumns[];
 
 extern ProcessClass LinuxProcess_class;
 
-LinuxProcess* LinuxProcess_new(Settings* settings);
+extern LinuxProcess* LinuxProcess_new(Settings* settings);
 
-void Process_delete(Object* cast);
+extern void Process_delete(Object* cast);
 
 /*
 [1] Note that before kernel 2.6.26 a process that has not asked for
@@ -166,19 +167,19 @@ extern io_priority;
 */
 #define LinuxProcess_effectiveIOPriority(p_) (IOPriority_class(p_->ioPriority) == IOPRIO_CLASS_NONE ? IOPriority_tuple(IOPRIO_CLASS_BE, (p_->super.nice + 20) / 5) : p_->ioPriority)
 
-IOPriority LinuxProcess_updateIOPriority(LinuxProcess* this);
+extern IOPriority LinuxProcess_updateIOPriority(LinuxProcess* this);
 
-bool LinuxProcess_setIOPriority(LinuxProcess* this, IOPriority ioprio);
+extern bool LinuxProcess_setIOPriority(LinuxProcess* this, IOPriority ioprio);
 
 #ifdef HAVE_DELAYACCT
-void LinuxProcess_printDelay(float delay_percent, char* buffer, int n);
+extern void LinuxProcess_printDelay(float delay_percent, char* buffer, int n);
 #endif
 
-void LinuxProcess_writeField(Process* this, RichString* str, ProcessField field);
+extern void LinuxProcess_writeField(Process* this, RichString* str, ProcessField field);
 
-long LinuxProcess_compare(const void* v1, const void* v2);
+extern long LinuxProcess_compare(const void* v1, const void* v2);
 
-bool Process_isThread(Process* this);
+extern bool Process_isThread(Process* this);
 
 
 #endif

scripts/MakeHeader.py

@@ -54,8 +54,10 @@ for line in file.readlines():
          elif line.startswith("typedef struct"):
             state = SKIP
          elif line[-1] == "{":
-            out.write( line[:-2].replace("inline", "extern") + ";\n" )
+            out.write("extern " + line[:-2].replace("inline ", "") + ";\n")
             state = SKIP
+         elif line[-1] == ";":
+            out.write("extern " + line + "\n")
          else:
             out.write( line + "\n")
          is_blank = False